1 /*******************************************************************************
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2 * Copyright (c) 2007, 2010 Association for Decentralized Information Management
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3 * in Industry THTH ry.
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4 * All rights reserved. This program and the accompanying materials
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5 * are made available under the terms of the Eclipse Public License v1.0
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6 * which accompanies this distribution, and is available at
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7 * http://www.eclipse.org/legal/epl-v10.html
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10 * VTT Technical Research Centre of Finland - initial API and implementation
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11 *******************************************************************************/
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12 package org.simantics.mapping.constraint.instructions;
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14 import org.simantics.db.ReadGraph;
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15 import org.simantics.db.exception.DatabaseException;
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17 public class OrInstruction extends CombinedInstruction {
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19 public OrInstruction(IInstruction... instructions) {
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20 super(instructions);
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23 static class Continuation {
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24 Object continuation;
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27 public Continuation(Object continuation, int instructionId) {
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28 this.continuation = continuation;
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29 this.instructionId = instructionId;
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34 public Object query(ReadGraph g, Object[] bindings) throws DatabaseException {
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36 for(instructionId=0;instructionId<instructions.length-1;++instructionId) {
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38 System.out.println("OrInstruction.query " + instructionId + "/" + instructions.length);
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39 Object continuation = instructions[instructionId].query(g, bindings);
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40 if(continuation != IInstruction.FAILURE)
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41 return new Continuation(continuation, instructionId);
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43 return instructions[instructionId].query(g, bindings);
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47 public Object next(ReadGraph g, Object[] bindings, Object ret_) throws DatabaseException {
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48 Continuation ret = (Continuation)ret_;
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49 int instructionId = ret.instructionId;
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50 Object continuation = ret.continuation;
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52 if(continuation != null) {
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53 continuation = instructions[instructionId].next(g, bindings, continuation);
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54 if(continuation != IInstruction.FAILURE) {
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55 ret.continuation = continuation;
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60 for(++instructionId;instructionId<instructions.length-1;++instructionId) {
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61 continuation = instructions[instructionId].query(g, bindings);
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62 if(continuation != IInstruction.FAILURE) {
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63 ret.continuation = continuation;
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64 ret.instructionId = instructionId;
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68 return instructions[instructionId].query(g, bindings);
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72 public void toString(StringBuilder b, int indent) {
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74 boolean first = true;
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75 for(IInstruction inst : instructions) {
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80 for(int i=0;i<indent+1;++i)
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81 b.append(INDENTATION);
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83 inst.toString(b, indent + 1);
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86 for(int i=0;i<indent;++i)
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87 b.append(INDENTATION);
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